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CVE-2008-3656

Algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value function in WEBrick::HTTP::DefaultFileHandler in WEBrick in Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted HTTP request that is processed by a backtracking regular…

Severity
High 7.8
Published
13 Aug 2008
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
70% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
CWE-399
Attack
Over the network · No login needed
Attacker can
Take it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:C
Sources
NVD

Description

Algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value function in WEBrick::HTTP::DefaultFileHandler in WEBrick in Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted HTTP request that is processed by a backtracking regular expression.

From NVD.

Affected software

SoftwareAffected versions
RubyServers and applications · cpe:a:ruby-lang:ruby
  • Version 1.9.0
  • Version 1.8.7-p71
  • Version 1.8.7-p22
  • Version 1.8.7-p17
All 43 release lines
  • Every version up to 1.8.5
  • Version 1.6.8
  • Version 1.8.0
  • Version 1.8.1
  • Version 1.8.1--9
  • Version 1.8.2-preview2
  • Version 1.8.2-preview3
  • Version 1.8.2-preview4
  • Version 1.8.2
  • Version 1.8.3-preview1
  • Version 1.8.3-preview2
  • Version 1.8.3-preview3
  • Version 1.8.3
  • Version 1.8.4-preview1
  • Version 1.8.4-preview2
  • Version 1.8.4-preview3
  • Version 1.8.4
  • Version 1.8.5-preview1
  • Version 1.8.5-preview2
  • Version 1.8.5-preview3
  • Version 1.8.5-preview4
  • Version 1.8.5-preview5
  • Version 1.8.5-p2
  • Version 1.8.5-p11
  • Version 1.8.5-p12
  • Version 1.8.5-p35
  • Version 1.8.5-p113
  • Version 1.8.5-p115
  • Version 1.8.6-preview1
  • Version 1.8.6-preview2
  • Version 1.8.6-preview3
  • Version 1.8.6
  • Version 1.8.6-p110
  • Version 1.8.6-p114
  • Version 1.8.7-preview1
  • Version 1.8.7-preview2
  • Version 1.8.7-preview3
  • Version 1.8.7-preview4
  • Version 1.8.7
  • Version 1.8.7-p17
  • Version 1.8.7-p22
  • Version 1.8.7-p71
  • Version 1.9.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2008-3656
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2008-3656